linux-kernel - Re: BUG: High resolution timer/dynticks bug

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Message-ID: <20080305082731.GA24004@atrey.karlin.mff.cuni.cz>
Date:	Wed, 5 Mar 2008 09:27:31 +0100
From:	Pavel Machek <pavel@....cz>
To:	Diego Woitasen <diego@...tasen.com.ar>
Cc:	tglx@...utronix.de, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: BUG: High resolution timer/dynticks bug

Hi!
> > > Hi!
> > > 	I have problems when enable dynticks or hrtimers in kernel >=
> > > 	2.6.24. It's easy to reproduce for me, when I enable either,
> > > 	boots the machine, browse the web with Firefox or unplug the
> > > 	power cable (i'm using a notebook) and the kernel freezes. I
> > > 	could get a error message using NMI watchdog and netconsole.
> > > 
> > > 	Please, tell me if you need more information or testing.
> > 
> > 
> > 
> > > NMI Watchdog detected LOCKUP on CPU 0
> > 
> > Just turn off NMI watchdog?
> > 
> > Pulling the power cable causes the SMM trap, which takes _long_ to
> > execute, potentially tickling NMI watchdog?
> 
> The system freezes silently without NMI watchdog :)

Ok... next hint:

> > > CPU 0 
> > > Modules linked in: netconsole configfs fan ebtable_broute bridge llc ebtable_nat ebtable_filter ebtables dm_snapshot dm_mirror dm_mod powernow_k8 loop arc4 snd_hda_intel ecb crypto_blkcipher cryptomgr snd_pcm_oss snd_pcm snd_mixer_oss b43 mac80211 cfg80211 crc32 snd_seq_dummy snd_seq_oss firmware_class snd_seq_midi_event ieee80211softmac snd_seq ieee80211 ieee80211_crypt snd_timer snd_seq_device i2c_nforce2 sdhci rng_core ohci1394 snd i2c_core battery ac thermal processor forcedeth mmc_core psmouse ssb ieee1394 button soundcore snd_page_alloc ehci_hcd ohci_hcd usbcore
> > > Pid: 0, comm: swapper Not tainted 2.6.25-rc3-porti-00081-g7704a8b #18
> > > RIP: 0010:[<ffffffff80220799>]  [<ffffffff80220799>] hpet_readl+0x9/0x10

Is RIP always here? If so, can you pinpoint which part of hpet_readl
causes the problem?

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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